Piezoelectric vibrator based on shear vibration and flexural vibration, flexural transducer and manufacturing method of flexural transducer

Abstract

The invention relates to a piezoelectric vibrator based on shear vibration and flexural vibration, a flexural transducer and a manufacturing method of the flexural transducer. According to the piezoelectric vibrator based on shear vibration and flexural vibration, the flexural transducer and the manufacturing method of the flexural transducer, with the limitations of the application of a d33 modeby a conventional 1-3 piezoelectric composite transducer eliminated, a d15 mode with a higher piezoelectric constant and an electromechanical coupling coefficient is selected to act as a vibration element; in order to avoid the defect of the shear vibration generation of the d15 mode, the shear vibration of the d15 mode is transformed to the flexural vibration of the upper surface and lower surface of a flexural shell through a special structural design, so that the shear vibration mode can be adopted to generate transverse waves; a low-frequency, high-power and small-sized transducer which ismanufactured on the basis of the d15 mode meets requirements such as underwater long-distance communication and detection. In the underwater sound field, the piezoelectric vibrator based on shear vibration and flexural vibration can improve the working distance and detection accuracy of a sonar system, and provide effective help for military detection, early warning, civil navigation, fishing andthe like.

Description

technical field [0001] The invention belongs to the technical field of piezoelectric transducers, in particular to a piezoelectric vibrator based on shear vibration and flexural vibration, a flexural transducer and a manufacturing method thereof. Background technique [0002] Piezoelectric composite materials, as the core sensitive materials of transducers, have undergone rapid development for nearly half a century. Because it not only has the performance of piezoelectric phase materials but also can improve the comprehensive performance of materials by adding polymer phases, it has an irreplaceable role in ultrasonic nondestructive testing, geological detection, underwater sonar, etc. [0003] The shear vibration mode of piezoelectric ceramics is one of the typical vibration modes. The polarization direction and the electric field direction are vertically distributed, and shear deformation occurs in the plane formed by the polarization direction and the electric field direc...

AI Technical Summary

Problems solved by technology

The piezoelectric strain constant d of the piezoelectric material 15 and permittivity did not decrease, while the piezoelectric voltage constant e 15 and shear modulus are reduced by 90%

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